diff options
Diffstat (limited to 'drivers/mtd/mtd_blkdevs.c')
| -rw-r--r-- | drivers/mtd/mtd_blkdevs.c | 42 |
1 files changed, 36 insertions, 6 deletions
diff --git a/drivers/mtd/mtd_blkdevs.c b/drivers/mtd/mtd_blkdevs.c index e0a2373bf0e..a534e1f0c34 100644 --- a/drivers/mtd/mtd_blkdevs.c +++ b/drivers/mtd/mtd_blkdevs.c @@ -40,7 +40,7 @@ static LIST_HEAD(blktrans_majors); static DEFINE_MUTEX(blktrans_ref_mutex); -void blktrans_dev_release(struct kref *kref) +static void blktrans_dev_release(struct kref *kref) { struct mtd_blktrans_dev *dev = container_of(kref, struct mtd_blktrans_dev, ref); @@ -67,7 +67,7 @@ unlock: return dev; } -void blktrans_dev_put(struct mtd_blktrans_dev *dev) +static void blktrans_dev_put(struct mtd_blktrans_dev *dev) { mutex_lock(&blktrans_ref_mutex); kref_put(&dev->ref, blktrans_dev_release); @@ -119,18 +119,43 @@ static int do_blktrans_request(struct mtd_blktrans_ops *tr, } } +int mtd_blktrans_cease_background(struct mtd_blktrans_dev *dev) +{ + if (kthread_should_stop()) + return 1; + + return dev->bg_stop; +} +EXPORT_SYMBOL_GPL(mtd_blktrans_cease_background); + static int mtd_blktrans_thread(void *arg) { struct mtd_blktrans_dev *dev = arg; + struct mtd_blktrans_ops *tr = dev->tr; struct request_queue *rq = dev->rq; struct request *req = NULL; + int background_done = 0; spin_lock_irq(rq->queue_lock); while (!kthread_should_stop()) { int res; + dev->bg_stop = false; if (!req && !(req = blk_fetch_request(rq))) { + if (tr->background && !background_done) { + spin_unlock_irq(rq->queue_lock); + mutex_lock(&dev->lock); + tr->background(dev); + mutex_unlock(&dev->lock); + spin_lock_irq(rq->queue_lock); + /* + * Do background processing just once per idle + * period. + */ + background_done = !dev->bg_stop; + continue; + } set_current_state(TASK_INTERRUPTIBLE); if (kthread_should_stop()) @@ -152,6 +177,8 @@ static int mtd_blktrans_thread(void *arg) if (!__blk_end_request_cur(req, res)) req = NULL; + + background_done = 0; } if (req) @@ -172,8 +199,10 @@ static void mtd_blktrans_request(struct request_queue *rq) if (!dev) while ((req = blk_fetch_request(rq)) != NULL) __blk_end_request_all(req, -ENODEV); - else + else { + dev->bg_stop = true; wake_up_process(dev->thread); + } } static int blktrans_open(struct block_device *bdev, fmode_t mode) @@ -379,9 +408,10 @@ int add_mtd_blktrans_dev(struct mtd_blktrans_dev *new) new->rq->queuedata = new; blk_queue_logical_block_size(new->rq, tr->blksize); - if (tr->discard) - queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, - new->rq); + if (tr->discard) { + queue_flag_set_unlocked(QUEUE_FLAG_DISCARD, new->rq); + new->rq->limits.max_discard_sectors = UINT_MAX; + } gd->queue = new->rq; |